期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1992
卷号：89
期号：18
页码：8803-8807
DOI：10.1073/pnas.89.18.8803
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Introduction of restriction enzyme along with linearized plasmid results in integration of plasmid DNA at genomic restriction sites in a high proportion of the resulting transformants. We have found that electroporating BamHI or EcoRI together with pyr5-6 plasmids cut with the same enzyme stimulates the efficiency of transformation in Dictyostelium discoideum more than 20-fold over the rate seen when plasmid DNA alone is introduced. Restriction enzyme-mediated integration generates insertions into genomic restriction sites in an apparently random manner, some of which cause mutations. About 1 in 400 of the Dictyostelium transformants displayed arrested or aberrant development. The integrated plasmid, along with flanking genomic DNA, was excised from some of these mutants, cloned in Escherichia coli, and used to transform other Dictyostelium cells. Homologous recombination within the flanking sequences resulted in the same phenotypes displayed by the original mutants, directly demonstrating that the affected genes were responsible for the specific morphological phenotypes. This method of insertional mutagenesis should be useful for tagging, and subsequent cloning, of many developmentally important genes that can be identified by their mutant phenotypes.
